On the Role of Apical Oxygens in High-Tc Cu-Oxides

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  • On the Role of Apical Oxygens in High-<I>T</I><SUB>c</SUB> Cu-Oxides
  • On the Role of Apical Oxygens in High T

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The role of apical oxygens in high-Tc Cu-oxides has been analyzed based on the effective Hamiltonian derived previously by the present authors. It turns out that these oxygens modulate notably the oxygen p-hole band structure, which leads to the enhancement of the long-range hopping integrals of the Zhang-Rice singlet. This effect is further enhanced if the distance between apical O and in-plane Cu is reduced. This finding may relate to the remarkable experimental result by Murayama et al. of the strong pressure dependence of Tc in the T* structure and its complete absence in the T′ structure.

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